to do an injection you will need an insulin pen enough insulin for the dose a new pen needle cotton wool or a tissue to prepare your pen attach a new needle onto it perform an air shot to clear any air out of the needle you should see a steady unbroken stream find a soft fatty area to inject into the best areas include the thighs the belly the bum and the upper arm the upper arm may not be recommended for people who only have a small amount of fat dial the dose needed here i'm going to put in five units of insulin take fold or flesh try to find a region that isn't tough or lumpy put the needle in push the plunger slowly hold the needle in for about 10 seconds to prevent any insulin from escaping if any blood and or insulin escapes wipe the skin with a cotton wool or tissue when you're done remove the needle and put it into a sharps disposal bin